Segments and Related Information (Schedule of Significant Customers, Revenue Concentration Information) (Details) (Reportable Segments [Member], Customer Concentration Risk [Member], Revenue [Member])	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
AT&T [Member] | Communications [Member]
Revenue, Significant Customers [Line Items]
Significant customers, percentage of total consolidated revenue	16.00%	[1]	16.00%	[1]	21.00%	[1]	18.00%	[1]
Segment reporting, disclosure of significant customers					The Company's relationship with AT&T is based upon master service agreements, other service agreements and construction/installation contracts for AT&T's wireless, wireline/fiber and home security and automation businesses. Revenue from AT&T is included in the Communications segment.
DIRECTV [Member] | Communications [Member]
Revenue, Significant Customers [Line Items]
Significant customers, percentage of total consolidated revenue	12.00%	[2]	13.00%	[2]	13.00%	[2]	15.00%	[2]
Segment reporting, disclosure of significant customers					The Company's relationship with DIRECTV® is based upon an agreement to provide installation and maintenance services for DIRECTV®. Revenue from DIRECTV® is included in the Communications segment.
Enbridge, Inc. [Member] | Oil and Gas [Member]
Revenue, Significant Customers [Line Items]
Significant customers, percentage of total consolidated revenue	10.00%	[3]	20.00%	[3]	10.00%	[3]	14.00%	[3]
Segment reporting, disclosure of significant customers					The Company's relationship with Enbridge, Inc. is based upon various construction contracts for natural gas pipelines. Revenue from Enbridge, Inc. is included in the Oil and Gas segment.

[1] The Company's relationship with AT&T is based upon master service agreements, other service agreements and construction/installation contracts for AT&T's wireless, wireline/fiber and home security and automation businesses. Revenue from AT&T is included in the Communications segment.

[2] The Company's relationship with DIRECTV® is based upon an agreement to provide installation and maintenance services for DIRECTV®. Revenue from DIRECTV® is included in the Communications segment.

[3] The Company's relationship with Enbridge, Inc. is based upon various construction contracts for natural gas pipelines. Revenue from Enbridge, Inc. is included in the Oil and Gas segment.